Electric fuse



"J y 1930- H. 'r. BUSSMANN 1,770,196

ELECTRIC FUSE Filed Nov. 10. 1924 INVENTOR fit/my 7." Ewan/my Patent edJuly-8, 193a I 1,770,196

UNITED STATES PATENT OFFICE HENRY '1'. BUSSMLNN, 01" ST. LOUIS, MISSOURIanaemic rosr.

Application filed November 10, 1924. Serial No. 749,075.

The object of my invention is to provide a be made without changing thescope of my link that will operate safely, possess desirinvention. -ableshort-circuit characteristics and afiord I claim:

a practical and efiicient time lag. '1. A fuse link having a relativelylong This application was filed at the same time non-fusing member and aplurality of rela- 55 as my application No. 749,074 and embodies lv lyshort fusing members, the non-fusing a t ti l d t il th f, member havinga hlgher melting point than In the drawings,'Fig. 1 shows a fuse link ht of a fusing member. v and Fig. 2 shows my invention applied to A ills?llnk f p be used a v l d f standard size casing having a relat1v ely 00In the drawings, 3 shows terminal memg u g member relatlvely h berswhich may be of any suitable material. meltlng PP and Plurahty of 3 4 isa member which in the operation of the fllslng members of a lower meltmgfuse is not designed to melt. This member P is made of a comparativelylow resistance An enclose? f11e havmg material, Such as copper, i hbecause f mmals therefor, a l1nk hav1n% a relatively its high currentcarrying capacity relative member y, 1gb meltmg to other parts of thelink makes this mem- P 5 p l of relatlvely h0rt 'g ber essentially f img portions of relatively low melting point. 5 shows fusing members ofthe link con- The combmafiwn of 335mg, temlmals nected to the member 4at the points 6. therefor e conneqted to Sa1d te1" These fusing membersneed not bevintegral minals, said fuse llIlk havlng a relatively withthe terminal members and may be of long central member and a pluralityof relaany suitable cross-sectional area. They are tlvely Short membexisshort members made of any material of relatively low melt- 33 3i z i gggg m than that of 75 figllrlxfgltselllgill-as zinc, lead, tin, or other7 HENRY T. BUSSMANN' The fusing members are made of'short lengthrelative to the member 4 and in the use of my invention I prefer to makethis 80 fusing section as short as is consistent with the securing ofdesirable short-circuit characteristics. For example in 250 and 600 voltlinks the fusing sections I prefer to make approximately /g of an inchin length. By my invention I obtain whatever advantages there are in theuse of a high melt ing point material for fuse purposes without itsdisadvantages, and I obtain a practi- 90 cal and commercially eflicienttime lag without incren sing the volume of metal that must bevolatilized when the fuse is blown on heavy short circuits.

In describing the arrangements employed 95 and shown in the drawingshereto attached and described in the specification, I do not limit myinvention to the precise form, shape or construction shown, or to theseveral parts thereto, inasmuch as various alterations may I

